 23 mm Master cylinder?, From a 930? |
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| HalfMoon |
 Oct 31 2017, 08:46 PM
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#1
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Senior Member  Group: Members Posts: 828 Joined: 13-November 12 From: Shenandoah Junction, WV Member No.: 15,144 Region Association: MidAtlantic Region  |
A friend of mine who owns a race shop that does alot of Porsche work said when queried about reducing travel on the 914 brake system that the 23mm master cylinder from a 930 would far better reduce the travel over a 19mm master cylinder.
Has anyone done this mod and if so, what were the performance gains/differences? Thanks D |
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| Dave_Darling |
Nov 1 2017, 09:48 PM
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#2
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914 Idiot Group: Members Posts: 15,063 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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When you change the diameter of the master cylinder, you are changing the hydraulic advantage over the brake pads. The effect is almost exactly the same as shortening the arm on the pedal. You get less travel but you have to push harder for the same clamping force.
--DD |
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| tomeric914 |
Nov 2 2017, 08:39 AM
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#3
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One Lap of America in a 914! Group: Members Posts: 1,263 Joined: 25-May 08 From: Syracuse, NY Member No.: 9,101 Region Association: North East States
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...on a bone stock brake system
QUOTE(Dave_Darling @ Nov 1 2017, 11:48 PM)  When you change the diameter of the master cylinder, you are changing the hydraulic advantage over the brake pads. The effect is almost exactly the same as shortening the arm on the pedal. You get less travel but you have to push harder for the same clamping force. --DD |
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Posts in this topic
HalfMoon 23 mm Master cylinder? Oct 31 2017, 08:46 PM
Vacca Rabite
A friend of mine who owns a race shop that does a... Oct 31 2017, 09:32 PM
HalfMoon
A friend of mine who owns a race shop that does ... Oct 31 2017, 10:05 PM porschetub
A friend of mine who owns a race shop that does a... Oct 31 2017, 10:19 PM Mike Bellis I'm running a 23 but I also have 930 brakes. I... Oct 31 2017, 10:39 PM HalfMoon
I'm running a 23 but I also have 930 brakes. ... Oct 31 2017, 10:56 PM shoguneagle Agree with all the above. I am running 23mm M/C w... Oct 31 2017, 10:52 PM HalfMoon
Agree with all the above. I am running 23mm M/C ... Oct 31 2017, 10:57 PM HalfMoon To clarify-
I run a 19mm too (as well as a variet... Oct 31 2017, 10:55 PM mepstein
To clarify-
I run a 19mm too (as well as a varie... Nov 1 2017, 05:30 AM jd74914
To clarify-
I run a 19mm too (as well as a vari... Nov 1 2017, 05:49 AM mepstein
[quote name='mepstein' post='2544209' date='Nov 1... Nov 1 2017, 05:58 AM HalfMoon
To clarify-
I run a 19mm too (as well as a vari... Nov 1 2017, 10:02 AM mepstein
[quote name='mepstein' post='2544209' date='Nov 1... Nov 1 2017, 11:36 AM porschetub
[quote name='mepstein' post='2544209' date='Nov ... Nov 1 2017, 04:59 PM infraredcalvin It’s not a 930 MC is a 23 mm ATE MC for a Merced... Oct 31 2017, 11:50 PM infraredcalvin Sorry had to edit above... Oct 31 2017, 11:55 PM flyer86d My old 911SC track car had turbo brakes front and ... Nov 1 2017, 05:30 AM DBCooper And, important to note, with just a larger m/c you... Nov 1 2017, 08:28 AM Racer Chris We just swapped out a 23mm M/C for a 22 mm VW unit... Nov 1 2017, 09:04 AM HalfMoon
We just swapped out a 23mm M/C for a 22 mm VW uni... Nov 1 2017, 10:05 AM mgp4591
We just swapped out a 23mm M/C for a 22 mm VW uni... Nov 1 2017, 11:05 AM Racer Chris
Is that the M/C for the Corrado that you swapped ... Nov 1 2017, 11:07 AM tomeric914 20.64mm or 22.22mm Master Cylinder Option How-To t... Nov 1 2017, 07:03 PM HalfMoon
20.64mm or 22.22mm Master Cylinder Option How-To ... Nov 2 2017, 05:38 PM Racer Chris
20.64mm or 22.22mm Master Cylinder Option How-To... Nov 2 2017, 07:08 PM tomeric914 David,
This is basic hydraulics, but somehow, too... Nov 2 2017, 07:54 PM HalfMoon
David,
This is basic hydraulics, but somehow, to... Nov 2 2017, 11:48 PM Keyser Sose I currently run a 19mm and find that their's s... Nov 3 2017, 10:56 AM Racer Chris
the bias valve can make it hard to get them full... Nov 3 2017, 03:03 PM Keyser Sose
the bias valve can make it hard to get them ful... Nov 3 2017, 03:37 PM Racer Chris
So do those valves ever go bad?
They don't ... Nov 4 2017, 09:06 AM tomeric914 THIS IS AN EXAMPLE ONLY!!! You need t... Nov 3 2017, 03:04 PM DBCooper OK, when I got my car the pedal was way too hard. ... Nov 1 2017, 10:34 AM Dave_Darling
...on a bone stock brake system
No, that's ... Nov 2 2017, 12:07 PM tomeric914 The reason for going with a larger master cylinder... Nov 2 2017, 07:36 PM SirAndy When you change the diameter of the master cylinde... Nov 2 2017, 11:19 AM porschetub
When you change the diameter of the master cylind... Nov 2 2017, 06:59 PM GeorgeRud Is the lack of a proportioning valve on the 911s b... Nov 4 2017, 09:19 AM |
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